Convert utility process extension ParseUpdate IPC to mojo

extensions/shell/utility/shell_content_utility_client.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/shell/utility/shell_content_utility_client.h"
 
 namespace extensions {
 
-ShellContentUtilityClient::ShellContentUtilityClient() {
-}
+ShellContentUtilityClient::ShellContentUtilityClient() = default;
 
-ShellContentUtilityClient::~ShellContentUtilityClient() {
-}
+ShellContentUtilityClient::~ShellContentUtilityClient() = default;
 
 void ShellContentUtilityClient::UtilityThreadStarted() {
-  UtilityHandler::UtilityThreadStarted();
-}
-
-bool ShellContentUtilityClient::OnMessageReceived(const IPC::Message& message) {
-  return utility_handler_.OnMessageReceived(message);
+  utility_handler::UtilityThreadStarted();
 }
 
 }  // namespace extensions